/* * drivers/mmc/host/omap_hsmmc.c * * Driver for OMAP2430/3430 MMC controller. * * Copyright (C) 2007 Texas Instruments. * * Authors: * Syed Mohammed Khasim * Madhusudhan * Mohit Jalori * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* OMAP HSMMC Host Controller Registers */ #define OMAP_HSMMC_SYSCONFIG 0x0010 #define OMAP_HSMMC_SYSSTATUS 0x0014 #define OMAP_HSMMC_CON 0x002C #define OMAP_HSMMC_BLK 0x0104 #define OMAP_HSMMC_ARG 0x0108 #define OMAP_HSMMC_CMD 0x010C #define OMAP_HSMMC_RSP10 0x0110 #define OMAP_HSMMC_RSP32 0x0114 #define OMAP_HSMMC_RSP54 0x0118 #define OMAP_HSMMC_RSP76 0x011C #define OMAP_HSMMC_DATA 0x0120 #define OMAP_HSMMC_HCTL 0x0128 #define OMAP_HSMMC_SYSCTL 0x012C #define OMAP_HSMMC_STAT 0x0130 #define OMAP_HSMMC_IE 0x0134 #define OMAP_HSMMC_ISE 0x0138 #define OMAP_HSMMC_CAPA 0x0140 #define VS18 (1 << 26) #define VS30 (1 << 25) #define SDVS18 (0x5 << 9) #define SDVS30 (0x6 << 9) #define SDVS33 (0x7 << 9) #define SDVS_MASK 0x00000E00 #define SDVSCLR 0xFFFFF1FF #define SDVSDET 0x00000400 #define AUTOIDLE 0x1 #define SDBP (1 << 8) #define DTO 0xe #define ICE 0x1 #define ICS 0x2 #define CEN (1 << 2) #define CLKD_MASK 0x0000FFC0 #define CLKD_SHIFT 6 #define DTO_MASK 0x000F0000 #define DTO_SHIFT 16 #define INT_EN_MASK 0x307F0033 #define BWR_ENABLE (1 << 4) #define BRR_ENABLE (1 << 5) #define DTO_ENABLE (1 << 20) #define INIT_STREAM (1 << 1) #define DP_SELECT (1 << 21) #define DDIR (1 << 4) #define DMA_EN 0x1 #define MSBS (1 << 5) #define BCE (1 << 1) #define FOUR_BIT (1 << 1) #define DW8 (1 << 5) #define CC 0x1 #define TC 0x02 #define OD 0x1 #define ERR (1 << 15) #define CMD_TIMEOUT (1 << 16) #define DATA_TIMEOUT (1 << 20) #define CMD_CRC (1 << 17) #define DATA_CRC (1 << 21) #define CARD_ERR (1 << 28) #define STAT_CLEAR 0xFFFFFFFF #define INIT_STREAM_CMD 0x00000000 #define DUAL_VOLT_OCR_BIT 7 #define SRC (1 << 25) #define SRD (1 << 26) #define SOFTRESET (1 << 1) #define RESETDONE (1 << 0) /* * FIXME: Most likely all the data using these _DEVID defines should come * from the platform_data, or implemented in controller and slot specific * functions. */ #define OMAP_MMC1_DEVID 0 #define OMAP_MMC2_DEVID 1 #define OMAP_MMC3_DEVID 2 #define OMAP_MMC4_DEVID 3 #define OMAP_MMC5_DEVID 4 #define MMC_TIMEOUT_MS 20 #define OMAP_MMC_MASTER_CLOCK 96000000 #define DRIVER_NAME "mmci-omap-hs" /* Timeouts for entering power saving states on inactivity, msec */ #define OMAP_MMC_DISABLED_TIMEOUT 100 #define OMAP_MMC_SLEEP_TIMEOUT 1000 #define OMAP_MMC_OFF_TIMEOUT 8000 /* * One controller can have multiple slots, like on some omap boards using * omap.c controller driver. Luckily this is not currently done on any known * omap_hsmmc.c device. */ #define mmc_slot(host) (host->pdata->slots[host->slot_id]) /* * MMC Host controller read/write API's */ #define OMAP_HSMMC_READ(base, reg) \ __raw_readl((base) + OMAP_HSMMC_##reg) #define OMAP_HSMMC_WRITE(base, reg, val) \ __raw_writel((val), (base) + OMAP_HSMMC_##reg) struct omap_hsmmc_host { struct device *dev; struct mmc_host *mmc; struct mmc_request *mrq; struct mmc_command *cmd; struct mmc_data *data; struct clk *fclk; struct clk *iclk; struct clk *dbclk; /* * vcc == configured supply * vcc_aux == optional * - MMC1, supply for DAT4..DAT7 * - MMC2/MMC2, external level shifter voltage supply, for * chip (SDIO, eMMC, etc) or transceiver (MMC2 only) */ struct regulator *vcc; struct regulator *vcc_aux; struct work_struct mmc_carddetect_work; void __iomem *base; resource_size_t mapbase; spinlock_t irq_lock; /* Prevent races with irq handler */ unsigned int id; unsigned int dma_len; unsigned int dma_sg_idx; unsigned char bus_mode; unsigned char power_mode; u32 *buffer; u32 bytesleft; int suspended; int irq; int use_dma, dma_ch; int dma_line_tx, dma_line_rx; int slot_id; int got_dbclk; int response_busy; int context_loss; int dpm_state; int vdd; int protect_card; int reqs_blocked; int use_reg; int req_in_progress; struct omap_mmc_platform_data *pdata; }; static int omap_hsmmc_card_detect(struct device *dev, int slot) { struct omap_mmc_platform_data *mmc = dev->platform_data; /* NOTE: assumes card detect signal is active-low */ return !gpio_get_value_cansleep(mmc->slots[0].switch_pin); } static int omap_hsmmc_get_wp(struct device *dev, int slot) { struct omap_mmc_platform_data *mmc = dev->platform_data; /* NOTE: assumes write protect signal is active-high */ return gpio_get_value_cansleep(mmc->slots[0].gpio_wp); } static int omap_hsmmc_get_cover_state(struct device *dev, int slot) { struct omap_mmc_platform_data *mmc = dev->platform_data; /* NOTE: assumes card detect signal is active-low */ return !gpio_get_value_cansleep(mmc->slots[0].switch_pin); } #ifdef CONFIG_PM static int omap_hsmmc_suspend_cdirq(struct device *dev, int slot) { struct omap_mmc_platform_data *mmc = dev->platform_data; disable_irq(mmc->slots[0].card_detect_irq); return 0; } static int omap_hsmmc_resume_cdirq(struct device *dev, int slot) { struct omap_mmc_platform_data *mmc = dev->platform_data; enable_irq(mmc->slots[0].card_detect_irq); return 0; } #else #define omap_hsmmc_suspend_cdirq NULL #define omap_hsmmc_resume_cdirq NULL #endif #ifdef CONFIG_REGULATOR static int omap_hsmmc_1_set_power(struct device *dev, int slot, int power_on, int vdd) { struct omap_hsmmc_host *host = platform_get_drvdata(to_platform_device(dev)); int ret; if (mmc_slot(host).before_set_reg) mmc_slot(host).before_set_reg(dev, slot, power_on, vdd); if (power_on) ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); else ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0); if (mmc_slot(host).after_set_reg) mmc_slot(host).after_set_reg(dev, slot, power_on, vdd); return ret; } static int omap_hsmmc_23_set_power(struct device *dev, int slot, int power_on, int vdd) { struct omap_hsmmc_host *host = platform_get_drvdata(to_platform_device(dev)); int ret = 0; /* * If we don't see a Vcc regulator, assume it's a fixed * voltage always-on regulator. */ if (!host->vcc) return 0; if (mmc_slot(host).before_set_reg) mmc_slot(host).before_set_reg(dev, slot, power_on, vdd); /* * Assume Vcc regulator is used only to power the card ... OMAP * VDDS is used to power the pins, optionally with a transceiver to * support cards using voltages other than VDDS (1.8V nominal). When a * transceiver is used, DAT3..7 are muxed as transceiver control pins. * * In some cases this regulator won't support enable/disable; * e.g. it's a fixed rail for a WLAN chip. * * In other cases vcc_aux switches interface power. Example, for * eMMC cards it represents VccQ. Sometimes transceivers or SDIO * chips/cards need an interface voltage rail too. */ if (power_on) { ret = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); /* Enable interface voltage rail, if needed */ if (ret == 0 && host->vcc_aux) { ret = regulator_enable(host->vcc_aux); if (ret < 0) ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0); } } else { /* Shut down the rail */ if (host->vcc_aux) ret = regulator_disable(host->vcc_aux); if (!ret) { /* Then proceed to shut down the local regulator */ ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0); } } if (mmc_slot(host).after_set_reg) mmc_slot(host).after_set_reg(dev, slot, power_on, vdd); return ret; } static int omap_hsmmc_1_set_sleep(struct device *dev, int slot, int sleep, int vdd, int cardsleep) { struct omap_hsmmc_host *host = platform_get_drvdata(to_platform_device(dev)); int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL; return regulator_set_mode(host->vcc, mode); } static int omap_hsmmc_23_set_sleep(struct device *dev, int slot, int sleep, int vdd, int cardsleep) { struct omap_hsmmc_host *host = platform_get_drvdata(to_platform_device(dev)); int err, mode; /* * If we don't see a Vcc regulator, assume it's a fixed * voltage always-on regulator. */ if (!host->vcc) return 0; mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL; if (!host->vcc_aux) return regulator_set_mode(host->vcc, mode); if (cardsleep) { /* VCC can be turned off if card is asleep */ if (sleep) err = mmc_regulator_set_ocr(host->mmc, host->vcc, 0); else err = mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); } else err = regulator_set_mode(host->vcc, mode); if (err) return err; if (!mmc_slot(host).vcc_aux_disable_is_sleep) return regulator_set_mode(host->vcc_aux, mode); if (sleep) return regulator_disable(host->vcc_aux); else return regulator_enable(host->vcc_aux); } static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host) { struct regulator *reg; int ret = 0; int ocr_value = 0; switch (host->id) { case OMAP_MMC1_DEVID: /* On-chip level shifting via PBIAS0/PBIAS1 */ mmc_slot(host).set_power = omap_hsmmc_1_set_power; mmc_slot(host).set_sleep = omap_hsmmc_1_set_sleep; break; case OMAP_MMC2_DEVID: case OMAP_MMC3_DEVID: /* Off-chip level shifting, or none */ mmc_slot(host).set_power = omap_hsmmc_23_set_power; mmc_slot(host).set_sleep = omap_hsmmc_23_set_sleep; break; default: pr_err("MMC%d configuration not supported!\n", host->id); return -EINVAL; } reg = regulator_get(host->dev, "vmmc"); if (IS_ERR(reg)) { dev_dbg(host->dev, "vmmc regulator missing\n"); /* * HACK: until fixed.c regulator is usable, * we don't require a main regulator * for MMC2 or MMC3 */ if (host->id == OMAP_MMC1_DEVID) { ret = PTR_ERR(reg); goto err; } } else { host->vcc = reg; ocr_value = mmc_regulator_get_ocrmask(reg); if (!mmc_slot(host).ocr_mask) { mmc_slot(host).ocr_mask = ocr_value; } else { if (!(mmc_slot(host).ocr_mask & ocr_value)) { pr_err("MMC%d ocrmask %x is not supported\n", host->id, mmc_slot(host).ocr_mask); mmc_slot(host).ocr_mask = 0; return -EINVAL; } } mmc_slot(host).ocr_mask = mmc_regulator_get_ocrmask(reg); /* Allow an aux regulator */ reg = regulator_get(host->dev, "vmmc_aux"); host->vcc_aux = IS_ERR(reg) ? NULL : reg; /* * UGLY HACK: workaround regulator framework bugs. * When the bootloader leaves a supply active, it's * initialized with zero usecount ... and we can't * disable it without first enabling it. Until the * framework is fixed, we need a workaround like this * (which is safe for MMC, but not in general). */ if (regulator_is_enabled(host->vcc) > 0) { regulator_enable(host->vcc); regulator_disable(host->vcc); } if (host->vcc_aux) { if (regulator_is_enabled(reg) > 0) { regulator_enable(reg); regulator_disable(reg); } } } return 0; err: mmc_slot(host).set_power = NULL; mmc_slot(host).set_sleep = NULL; return ret; } static void omap_hsmmc_reg_put(struct omap_hsmmc_host *host) { regulator_put(host->vcc); regulator_put(host->vcc_aux); mmc_slot(host).set_power = NULL; mmc_slot(host).set_sleep = NULL; } static inline int omap_hsmmc_have_reg(void) { return 1; } #else static inline int omap_hsmmc_reg_get(struct omap_hsmmc_host *host) { return -EINVAL; } static inline void omap_hsmmc_reg_put(struct omap_hsmmc_host *host) { } static inline int omap_hsmmc_have_reg(void) { return 0; } #endif static int omap_hsmmc_gpio_init(struct omap_mmc_platform_data *pdata) { int ret; if (gpio_is_valid(pdata->slots[0].switch_pin)) { pdata->suspend = omap_hsmmc_suspend_cdirq; pdata->resume = omap_hsmmc_resume_cdirq; if (pdata->slots[0].cover) pdata->slots[0].get_cover_state = omap_hsmmc_get_cover_state; else pdata->slots[0].card_detect = omap_hsmmc_card_detect; pdata->slots[0].card_detect_irq = gpio_to_irq(pdata->slots[0].switch_pin); ret = gpio_request(pdata->slots[0].switch_pin, "mmc_cd"); if (ret) return ret; ret = gpio_direction_input(pdata->slots[0].switch_pin); if (ret) goto err_free_sp; } else pdata->slots[0].switch_pin = -EINVAL; if (gpio_is_valid(pdata->slots[0].gpio_wp)) { pdata->slots[0].get_ro = omap_hsmmc_get_wp; ret = gpio_request(pdata->slots[0].gpio_wp, "mmc_wp"); if (ret) goto err_free_cd; ret = gpio_direction_input(pdata->slots[0].gpio_wp); if (ret) goto err_free_wp; } else pdata->slots[0].gpio_wp = -EINVAL; return 0; err_free_wp: gpio_free(pdata->slots[0].gpio_wp); err_free_cd: if (gpio_is_valid(pdata->slots[0].switch_pin)) err_free_sp: gpio_free(pdata->slots[0].switch_pin); return ret; } static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata) { if (gpio_is_valid(pdata->slots[0].gpio_wp)) gpio_free(pdata->slots[0].gpio_wp); if (gpio_is_valid(pdata->slots[0].switch_pin)) gpio_free(pdata->slots[0].switch_pin); } /* * Stop clock to the card */ static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host) { OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN); if ((OMAP_HSMMC_READ(host->base, SYSCTL) & CEN) != 0x0) dev_dbg(mmc_dev(host->mmc), "MMC Clock is not stoped\n"); } static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host, struct mmc_command *cmd) { unsigned int irq_mask; if (host->use_dma) irq_mask = INT_EN_MASK & ~(BRR_ENABLE | BWR_ENABLE); else irq_mask = INT_EN_MASK; /* Disable timeout for erases */ if (cmd->opcode == MMC_ERASE) irq_mask &= ~DTO_ENABLE; OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); OMAP_HSMMC_WRITE(host->base, ISE, irq_mask); OMAP_HSMMC_WRITE(host->base, IE, irq_mask); } static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host) { OMAP_HSMMC_WRITE(host->base, ISE, 0); OMAP_HSMMC_WRITE(host->base, IE, 0); OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); } #ifdef CONFIG_PM /* * Restore the MMC host context, if it was lost as result of a * power state change. */ static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host) { struct mmc_ios *ios = &host->mmc->ios; struct omap_mmc_platform_data *pdata = host->pdata; int context_loss = 0; u32 hctl, capa, con; u16 dsor = 0; unsigned long timeout; if (pdata->get_context_loss_count) { context_loss = pdata->get_context_loss_count(host->dev); if (context_loss < 0) return 1; } dev_dbg(mmc_dev(host->mmc), "context was %slost\n", context_loss == host->context_loss ? "not " : ""); if (host->context_loss == context_loss) return 1; /* Wait for hardware reset */ timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE && time_before(jiffies, timeout)) ; /* Do software reset */ OMAP_HSMMC_WRITE(host->base, SYSCONFIG, SOFTRESET); timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); while ((OMAP_HSMMC_READ(host->base, SYSSTATUS) & RESETDONE) != RESETDONE && time_before(jiffies, timeout)) ; OMAP_HSMMC_WRITE(host->base, SYSCONFIG, OMAP_HSMMC_READ(host->base, SYSCONFIG) | AUTOIDLE); if (host->id == OMAP_MMC1_DEVID) { if (host->power_mode != MMC_POWER_OFF && (1 << ios->vdd) <= MMC_VDD_23_24) hctl = SDVS18; else hctl = SDVS30; capa = VS30 | VS18; } else { hctl = SDVS18; capa = VS18; } OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) | hctl); OMAP_HSMMC_WRITE(host->base, CAPA, OMAP_HSMMC_READ(host->base, CAPA) | capa); OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) | SDBP); timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP && time_before(jiffies, timeout)) ; omap_hsmmc_disable_irq(host); /* Do not initialize card-specific things if the power is off */ if (host->power_mode == MMC_POWER_OFF) goto out; con = OMAP_HSMMC_READ(host->base, CON); switch (ios->bus_width) { case MMC_BUS_WIDTH_8: OMAP_HSMMC_WRITE(host->base, CON, con | DW8); break; case MMC_BUS_WIDTH_4: OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8); OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT); break; case MMC_BUS_WIDTH_1: OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8); OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT); break; } if (ios->clock) { dsor = OMAP_MMC_MASTER_CLOCK / ios->clock; if (dsor < 1) dsor = 1; if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock) dsor++; if (dsor > 250) dsor = 250; } OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) & ~CEN); OMAP_HSMMC_WRITE(host->base, SYSCTL, (dsor << 6) | (DTO << 16)); OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS && time_before(jiffies, timeout)) ; OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | CEN); con = OMAP_HSMMC_READ(host->base, CON); if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) OMAP_HSMMC_WRITE(host->base, CON, con | OD); else OMAP_HSMMC_WRITE(host->base, CON, con & ~OD); out: host->context_loss = context_loss; dev_dbg(mmc_dev(host->mmc), "context is restored\n"); return 0; } /* * Save the MMC host context (store the number of power state changes so far). */ static void omap_hsmmc_context_save(struct omap_hsmmc_host *host) { struct omap_mmc_platform_data *pdata = host->pdata; int context_loss; if (pdata->get_context_loss_count) { context_loss = pdata->get_context_loss_count(host->dev); if (context_loss < 0) return; host->context_loss = context_loss; } } #else static int omap_hsmmc_context_restore(struct omap_hsmmc_host *host) { return 0; } static void omap_hsmmc_context_save(struct omap_hsmmc_host *host) { } #endif /* * Send init stream sequence to card * before sending IDLE command */ static void send_init_stream(struct omap_hsmmc_host *host) { int reg = 0; unsigned long timeout; if (host->protect_card) return; disable_irq(host->irq); OMAP_HSMMC_WRITE(host->base, IE, INT_EN_MASK); OMAP_HSMMC_WRITE(host->base, CON, OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM); OMAP_HSMMC_WRITE(host->base, CMD, INIT_STREAM_CMD); timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); while ((reg != CC) && time_before(jiffies, timeout)) reg = OMAP_HSMMC_READ(host->base, STAT) & CC; OMAP_HSMMC_WRITE(host->base, CON, OMAP_HSMMC_READ(host->base, CON) & ~INIT_STREAM); OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR); OMAP_HSMMC_READ(host->base, STAT); enable_irq(host->irq); } static inline int omap_hsmmc_cover_is_closed(struct omap_hsmmc_host *host) { int r = 1; if (mmc_slot(host).get_cover_state) r = mmc_slot(host).get_cover_state(host->dev, host->slot_id); return r; } static ssize_t omap_hsmmc_show_cover_switch(struct device *dev, struct device_attribute *attr, char *buf) { struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); struct omap_hsmmc_host *host = mmc_priv(mmc); return sprintf(buf, "%s\n", omap_hsmmc_cover_is_closed(host) ? "closed" : "open"); } static DEVICE_ATTR(cover_switch, S_IRUGO, omap_hsmmc_show_cover_switch, NULL); static ssize_t omap_hsmmc_show_slot_name(struct device *dev, struct device_attribute *attr, char *buf) { struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); struct omap_hsmmc_host *host = mmc_priv(mmc); return sprintf(buf, "%s\n", mmc_slot(host).name); } static DEVICE_ATTR(slot_name, S_IRUGO, omap_hsmmc_show_slot_name, NULL); /* * Configure the response type and send the cmd. */ static void omap_hsmmc_start_command(struct omap_hsmmc_host *host, struct mmc_command *cmd, struct mmc_data *data) { int cmdreg = 0, resptype = 0, cmdtype = 0; dev_dbg(mmc_dev(host->mmc), "%s: CMD%d, argument 0x%08x\n", mmc_hostname(host->mmc), cmd->opcode, cmd->arg); host->cmd = cmd; omap_hsmmc_enable_irq(host, cmd); host->response_busy = 0; if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_136) resptype = 1; else if (cmd->flags & MMC_RSP_BUSY) { resptype = 3; host->response_busy = 1; } else resptype = 2; } /* * Unlike OMAP1 controller, the cmdtype does not seem to be based on * ac, bc, adtc, bcr. Only commands ending an open ended transfer need * a val of 0x3, rest 0x0. */ if (cmd == host->mrq->stop) cmdtype = 0x3; cmdreg = (cmd->opcode << 24) | (resptype << 16) | (cmdtype << 22); if (data) { cmdreg |= DP_SELECT | MSBS | BCE; if (data->flags & MMC_DATA_READ) cmdreg |= DDIR; else cmdreg &= ~(DDIR); } if (host->use_dma) cmdreg |= DMA_EN; host->req_in_progress = 1; OMAP_HSMMC_WRITE(host->base, ARG, cmd->arg); OMAP_HSMMC_WRITE(host->base, CMD, cmdreg); } static int omap_hsmmc_get_dma_dir(struct omap_hsmmc_host *host, struct mmc_data *data) { if (data->flags & MMC_DATA_WRITE) return DMA_TO_DEVICE; else return DMA_FROM_DEVICE; } static void omap_hsmmc_request_done(struct omap_hsmmc_host *host, struct mmc_request *mrq) { int dma_ch; spin_lock(&host->irq_lock); host->req_in_progress = 0; dma_ch = host->dma_ch; spin_unlock(&host->irq_lock); omap_hsmmc_disable_irq(host); /* Do not complete the request if DMA is still in progress */ if (mrq->data && host->use_dma && dma_ch != -1) return; host->mrq = NULL; mmc_request_done(host->mmc, mrq); } /* * Notify the transfer complete to MMC core */ static void omap_hsmmc_xfer_done(struct omap_hsmmc_host *host, struct mmc_data *data) { if (!data) { struct mmc_request *mrq = host->mrq; /* TC before CC from CMD6 - don't know why, but it happens */ if (host->cmd && host->cmd->opcode == 6 && host->response_busy) { host->response_busy = 0; return; } omap_hsmmc_request_done(host, mrq); return; } host->data = NULL; if (!data->error) data->bytes_xfered += data->blocks * (data->blksz); else data->bytes_xfered = 0; if (!data->stop) { omap_hsmmc_request_done(host, data->mrq); return; } omap_hsmmc_start_command(host, data->stop, NULL); } /* * Notify the core about command completion */ static void omap_hsmmc_cmd_done(struct omap_hsmmc_host *host, struct mmc_command *cmd) { host->cmd = NULL; if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_136) { /* response type 2 */ cmd->resp[3] = OMAP_HSMMC_READ(host->base, RSP10); cmd->resp[2] = OMAP_HSMMC_READ(host->base, RSP32); cmd->resp[1] = OMAP_HSMMC_READ(host->base, RSP54); cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP76); } else { /* response types 1, 1b, 3, 4, 5, 6 */ cmd->resp[0] = OMAP_HSMMC_READ(host->base, RSP10); } } if ((host->data == NULL && !host->response_busy) || cmd->error) omap_hsmmc_request_done(host, cmd->mrq); } /* * DMA clean up for command errors */ static void omap_hsmmc_dma_cleanup(struct omap_hsmmc_host *host, int errno) { int dma_ch; host->data->error = errno; spin_lock(&host->irq_lock); dma_ch = host->dma_ch; host->dma_ch = -1; spin_unlock(&host->irq_lock); if (host->use_dma && dma_ch != -1) { dma_unmap_sg(mmc_dev(host->mmc), host->data->sg, host->dma_len, omap_hsmmc_get_dma_dir(host, host->data)); omap_free_dma(dma_ch); } host->data = NULL; } /* * Readable error output */ #ifdef CONFIG_MMC_DEBUG static void omap_hsmmc_report_irq(struct omap_hsmmc_host *host, u32 status) { /* --- means reserved bit without definition at documentation */ static const char *omap_hsmmc_status_bits[] = { "CC", "TC", "BGE", "---", "BWR", "BRR", "---", "---", "CIRQ", "OBI", "---", "---", "---", "---", "---", "ERRI", "CTO", "CCRC", "CEB", "CIE", "DTO", "DCRC", "DEB", "---", "ACE", "---", "---", "---", "---", "CERR", "CERR", "BADA", "---", "---", "---" }; char res[256]; char *buf = res; int len, i; len = sprintf(buf, "MMC IRQ 0x%x :", status); buf += len; for (i = 0; i < ARRAY_SIZE(omap_hsmmc_status_bits); i++) if (status & (1 << i)) { len = sprintf(buf, " %s", omap_hsmmc_status_bits[i]); buf += len; } dev_dbg(mmc_dev(host->mmc), "%s\n", res); } #endif /* CONFIG_MMC_DEBUG */ /* * MMC controller internal state machines reset * * Used to reset command or data internal state machines, using respectively * SRC or SRD bit of SYSCTL register * Can be called from interrupt context */ static inline void omap_hsmmc_reset_controller_fsm(struct omap_hsmmc_host *host, unsigned long bit) { unsigned long i = 0; unsigned long limit = (loops_per_jiffy * msecs_to_jiffies(MMC_TIMEOUT_MS)); OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | bit); /* * OMAP4 ES2 and greater has an updated reset logic. * Monitor a 0->1 transition first */ if (mmc_slot(host).features & HSMMC_HAS_UPDATED_RESET) { while ((!(OMAP_HSMMC_READ(host, SYSCTL) & bit)) && (i++ < limit)) cpu_relax(); } i = 0; while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) && (i++ < limit)) cpu_relax(); if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit) dev_err(mmc_dev(host->mmc), "Timeout waiting on controller reset in %s\n", __func__); } static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status) { struct mmc_data *data; int end_cmd = 0, end_trans = 0; if (!host->req_in_progress) { do { OMAP_HSMMC_WRITE(host->base, STAT, status); /* Flush posted write */ status = OMAP_HSMMC_READ(host->base, STAT); } while (status & INT_EN_MASK); return; } data = host->data; dev_dbg(mmc_dev(host->mmc), "IRQ Status is %x\n", status); if (status & ERR) { #ifdef CONFIG_MMC_DEBUG omap_hsmmc_report_irq(host, status); #endif if ((status & CMD_TIMEOUT) || (status & CMD_CRC)) { if (host->cmd) { if (status & CMD_TIMEOUT) { omap_hsmmc_reset_controller_fsm(host, SRC); host->cmd->error = -ETIMEDOUT; } else { host->cmd->error = -EILSEQ; } end_cmd = 1; } if (host->data || host->response_busy) { if (host->data) omap_hsmmc_dma_cleanup(host, -ETIMEDOUT); host->response_busy = 0; omap_hsmmc_reset_controller_fsm(host, SRD); } } if ((status & DATA_TIMEOUT) || (status & DATA_CRC)) { if (host->data || host->response_busy) { int err = (status & DATA_TIMEOUT) ? -ETIMEDOUT : -EILSEQ; if (host->data) omap_hsmmc_dma_cleanup(host, err); else host->mrq->cmd->error = err; host->response_busy = 0; omap_hsmmc_reset_controller_fsm(host, SRD); end_trans = 1; } } if (status & CARD_ERR) { dev_dbg(mmc_dev(host->mmc), "Ignoring card err CMD%d\n", host->cmd->opcode); if (host->cmd) end_cmd = 1; if (host->data) end_trans = 1; } } OMAP_HSMMC_WRITE(host->base, STAT, status); if (end_cmd || ((status & CC) && host->cmd)) omap_hsmmc_cmd_done(host, host->cmd); if ((end_trans || (status & TC)) && host->mrq) omap_hsmmc_xfer_done(host, data); } /* * MMC controller IRQ handler */ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id) { struct omap_hsmmc_host *host = dev_id; int status; status = OMAP_HSMMC_READ(host->base, STAT); do { omap_hsmmc_do_irq(host, status); /* Flush posted write */ status = OMAP_HSMMC_READ(host->base, STAT); } while (status & INT_EN_MASK); return IRQ_HANDLED; } static void set_sd_bus_power(struct omap_hsmmc_host *host) { unsigned long i; OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) | SDBP); for (i = 0; i < loops_per_jiffy; i++) { if (OMAP_HSMMC_READ(host->base, HCTL) & SDBP) break; cpu_relax(); } } /* * Switch MMC interface voltage ... only relevant for MMC1. * * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver. * The MMC2 transceiver controls are used instead of DAT4..DAT7. * Some chips, like eMMC ones, use internal transceivers. */ static int omap_hsmmc_switch_opcond(struct omap_hsmmc_host *host, int vdd) { u32 reg_val = 0; int ret; /* Disable the clocks */ clk_disable(host->fclk); clk_disable(host->iclk); if (host->got_dbclk) clk_disable(host->dbclk); /* Turn the power off */ ret = mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); /* Turn the power ON with given VDD 1.8 or 3.0v */ if (!ret) ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1, vdd); clk_enable(host->iclk); clk_enable(host->fclk); if (host->got_dbclk) clk_enable(host->dbclk); if (ret != 0) goto err; OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR); reg_val = OMAP_HSMMC_READ(host->base, HCTL); /* * If a MMC dual voltage card is detected, the set_ios fn calls * this fn with VDD bit set for 1.8V. Upon card removal from the * slot, omap_hsmmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF. * * Cope with a bit of slop in the range ... per data sheets: * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max, * but recommended values are 1.71V to 1.89V * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max, * but recommended values are 2.7V to 3.3V * * Board setup code shouldn't permit anything very out-of-range. * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the * middle range) but VSIM can't power DAT4..DAT7 at more than 3V. */ if ((1 << vdd) <= MMC_VDD_23_24) reg_val |= SDVS18; else reg_val |= SDVS30; OMAP_HSMMC_WRITE(host->base, HCTL, reg_val); set_sd_bus_power(host); return 0; err: dev_dbg(mmc_dev(host->mmc), "Unable to switch operating voltage\n"); return ret; } /* Protect the card while the cover is open */ static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host) { if (!mmc_slot(host).get_cover_state) return; host->reqs_blocked = 0; if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) { if (host->protect_card) { printk(KERN_INFO "%s: cover is closed, " "card is now accessible\n", mmc_hostname(host->mmc)); host->protect_card = 0; } } else { if (!host->protect_card) { printk(KERN_INFO "%s: cover is open, " "card is now inaccessible\n", mmc_hostname(host->mmc)); host->protect_card = 1; } } } /* * Work Item to notify the core about card insertion/removal */ static void omap_hsmmc_detect(struct work_struct *work) { struct omap_hsmmc_host *host = container_of(work, struct omap_hsmmc_host, mmc_carddetect_work); struct omap_mmc_slot_data *slot = &mmc_slot(host); int carddetect; if (host->suspended) return; sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch"); if (slot->card_detect) carddetect = slot->card_detect(host->dev, host->slot_id); else { omap_hsmmc_protect_card(host); carddetect = -ENOSYS; } if (carddetect) mmc_detect_change(host->mmc, (HZ * 200) / 1000); else mmc_detect_change(host->mmc, (HZ * 50) / 1000); } /* * ISR for handling card insertion and removal */ static irqreturn_t omap_hsmmc_cd_handler(int irq, void *dev_id) { struct omap_hsmmc_host *host = (struct omap_hsmmc_host *)dev_id; if (host->suspended) return IRQ_HANDLED; schedule_work(&host->mmc_carddetect_work); return IRQ_HANDLED; } static int omap_hsmmc_get_dma_sync_dev(struct omap_hsmmc_host *host, struct mmc_data *data) { int sync_dev; if (data->flags & MMC_DATA_WRITE) sync_dev = host->dma_line_tx; else sync_dev = host->dma_line_rx; return sync_dev; } static void omap_hsmmc_config_dma_params(struct omap_hsmmc_host *host, struct mmc_data *data, struct scatterlist *sgl) { int blksz, nblk, dma_ch; dma_ch = host->dma_ch; if (data->flags & MMC_DATA_WRITE) { omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT, (host->mapbase + OMAP_HSMMC_DATA), 0, 0); omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC, sg_dma_address(sgl), 0, 0); } else { omap_set_dma_src_params(dma_ch, 0, OMAP_DMA_AMODE_CONSTANT, (host->mapbase + OMAP_HSMMC_DATA), 0, 0); omap_set_dma_dest_params(dma_ch, 0, OMAP_DMA_AMODE_POST_INC, sg_dma_address(sgl), 0, 0); } blksz = host->data->blksz; nblk = sg_dma_len(sgl) / blksz; omap_set_dma_transfer_params(dma_ch, OMAP_DMA_DATA_TYPE_S32, blksz / 4, nblk, OMAP_DMA_SYNC_FRAME, omap_hsmmc_get_dma_sync_dev(host, data), !(data->flags & MMC_DATA_WRITE)); omap_start_dma(dma_ch); } /* * DMA call back function */ static void omap_hsmmc_dma_cb(int lch, u16 ch_status, void *cb_data) { struct omap_hsmmc_host *host = cb_data; struct mmc_data *data = host->mrq->data; int dma_ch, req_in_progress; if (!(ch_status & OMAP_DMA_BLOCK_IRQ)) { dev_warn(mmc_dev(host->mmc), "unexpected dma status %x\n", ch_status); return; } spin_lock(&host->irq_lock); if (host->dma_ch < 0) { spin_unlock(&host->irq_lock); return; } host->dma_sg_idx++; if (host->dma_sg_idx < host->dma_len) { /* Fire up the next transfer. */ omap_hsmmc_config_dma_params(host, data, data->sg + host->dma_sg_idx); spin_unlock(&host->irq_lock); return; } dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len, omap_hsmmc_get_dma_dir(host, data)); req_in_progress = host->req_in_progress; dma_ch = host->dma_ch; host->dma_ch = -1; spin_unlock(&host->irq_lock); omap_free_dma(dma_ch); /* If DMA has finished after TC, complete the request */ if (!req_in_progress) { struct mmc_request *mrq = host->mrq; host->mrq = NULL; mmc_request_done(host->mmc, mrq); } } /* * Routine to configure and start DMA for the MMC card */ static int omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host, struct mmc_request *req) { int dma_ch = 0, ret = 0, i; struct mmc_data *data = req->data; /* Sanity check: all the SG entries must be aligned by block size. */ for (i = 0; i < data->sg_len; i++) { struct scatterlist *sgl; sgl = data->sg + i; if (sgl->length % data->blksz) return -EINVAL; } if ((data->blksz % 4) != 0) /* REVISIT: The MMC buffer increments only when MSB is written. * Return error for blksz which is non multiple of four. */ return -EINVAL; BUG_ON(host->dma_ch != -1); ret = omap_request_dma(omap_hsmmc_get_dma_sync_dev(host, data), "MMC/SD", omap_hsmmc_dma_cb, host, &dma_ch); if (ret != 0) { dev_err(mmc_dev(host->mmc), "%s: omap_request_dma() failed with %d\n", mmc_hostname(host->mmc), ret); return ret; } host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, omap_hsmmc_get_dma_dir(host, data)); host->dma_ch = dma_ch; host->dma_sg_idx = 0; omap_hsmmc_config_dma_params(host, data, data->sg); return 0; } static void set_data_timeout(struct omap_hsmmc_host *host, unsigned int timeout_ns, unsigned int timeout_clks) { unsigned int timeout, cycle_ns; uint32_t reg, clkd, dto = 0; reg = OMAP_HSMMC_READ(host->base, SYSCTL); clkd = (reg & CLKD_MASK) >> CLKD_SHIFT; if (clkd == 0) clkd = 1; cycle_ns = 1000000000 / (clk_get_rate(host->fclk) / clkd); timeout = timeout_ns / cycle_ns; timeout += timeout_clks; if (timeout) { while ((timeout & 0x80000000) == 0) { dto += 1; timeout <<= 1; } dto = 31 - dto; timeout <<= 1; if (timeout && dto) dto += 1; if (dto >= 13) dto -= 13; else dto = 0; if (dto > 14) dto = 14; } reg &= ~DTO_MASK; reg |= dto << DTO_SHIFT; OMAP_HSMMC_WRITE(host->base, SYSCTL, reg); } /* * Configure block length for MMC/SD cards and initiate the transfer. */ static int omap_hsmmc_prepare_data(struct omap_hsmmc_host *host, struct mmc_request *req) { int ret; host->data = req->data; if (req->data == NULL) { OMAP_HSMMC_WRITE(host->base, BLK, 0); /* * Set an arbitrary 100ms data timeout for commands with * busy signal. */ if (req->cmd->flags & MMC_RSP_BUSY) set_data_timeout(host, 100000000U, 0); return 0; } OMAP_HSMMC_WRITE(host->base, BLK, (req->data->blksz) | (req->data->blocks << 16)); set_data_timeout(host, req->data->timeout_ns, req->data->timeout_clks); if (host->use_dma) { ret = omap_hsmmc_start_dma_transfer(host, req); if (ret != 0) { dev_dbg(mmc_dev(host->mmc), "MMC start dma failure\n"); return ret; } } return 0; } /* * Request function. for read/write operation */ static void omap_hsmmc_request(struct mmc_host *mmc, struct mmc_request *req) { struct omap_hsmmc_host *host = mmc_priv(mmc); int err; BUG_ON(host->req_in_progress); BUG_ON(host->dma_ch != -1); if (host->protect_card) { if (host->reqs_blocked < 3) { /* * Ensure the controller is left in a consistent * state by resetting the command and data state * machines. */ omap_hsmmc_reset_controller_fsm(host, SRD); omap_hsmmc_reset_controller_fsm(host, SRC); host->reqs_blocked += 1; } req->cmd->error = -EBADF; if (req->data) req->data->error = -EBADF; req->cmd->retries = 0; mmc_request_done(mmc, req); return; } else if (host->reqs_blocked) host->reqs_blocked = 0; WARN_ON(host->mrq != NULL); host->mrq = req; err = omap_hsmmc_prepare_data(host, req); if (err) { req->cmd->error = err; if (req->data) req->data->error = err; host->mrq = NULL; mmc_request_done(mmc, req); return; } omap_hsmmc_start_command(host, req->cmd, req->data); } /* Routine to configure clock values. Exposed API to core */ static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct omap_hsmmc_host *host = mmc_priv(mmc); u16 dsor = 0; unsigned long regval; unsigned long timeout; u32 con; int do_send_init_stream = 0; mmc_host_enable(host->mmc); if (ios->power_mode != host->power_mode) { switch (ios->power_mode) { case MMC_POWER_OFF: mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); host->vdd = 0; break; case MMC_POWER_UP: mmc_slot(host).set_power(host->dev, host->slot_id, 1, ios->vdd); host->vdd = ios->vdd; break; case MMC_POWER_ON: do_send_init_stream = 1; break; } host->power_mode = ios->power_mode; } /* FIXME: set registers based only on changes to ios */ con = OMAP_HSMMC_READ(host->base, CON); switch (mmc->ios.bus_width) { case MMC_BUS_WIDTH_8: OMAP_HSMMC_WRITE(host->base, CON, con | DW8); break; case MMC_BUS_WIDTH_4: OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8); OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) | FOUR_BIT); break; case MMC_BUS_WIDTH_1: OMAP_HSMMC_WRITE(host->base, CON, con & ~DW8); OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) & ~FOUR_BIT); break; } if (host->id == OMAP_MMC1_DEVID) { /* Only MMC1 can interface at 3V without some flavor * of external transceiver; but they all handle 1.8V. */ if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) && (ios->vdd == DUAL_VOLT_OCR_BIT)) { /* * The mmc_select_voltage fn of the core does * not seem to set the power_mode to * MMC_POWER_UP upon recalculating the voltage. * vdd 1.8v. */ if (omap_hsmmc_switch_opcond(host, ios->vdd) != 0) dev_dbg(mmc_dev(host->mmc), "Switch operation failed\n"); } } if (ios->clock) { dsor = OMAP_MMC_MASTER_CLOCK / ios->clock; if (dsor < 1) dsor = 1; if (OMAP_MMC_MASTER_CLOCK / dsor > ios->clock) dsor++; if (dsor > 250) dsor = 250; } omap_hsmmc_stop_clock(host); regval = OMAP_HSMMC_READ(host->base, SYSCTL); regval = regval & ~(CLKD_MASK); regval = regval | (dsor << 6) | (DTO << 16); OMAP_HSMMC_WRITE(host->base, SYSCTL, regval); OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | ICE); /* Wait till the ICS bit is set */ timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS); while ((OMAP_HSMMC_READ(host->base, SYSCTL) & ICS) != ICS && time_before(jiffies, timeout)) msleep(1); OMAP_HSMMC_WRITE(host->base, SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | CEN); if (do_send_init_stream) send_init_stream(host); con = OMAP_HSMMC_READ(host->base, CON); if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) OMAP_HSMMC_WRITE(host->base, CON, con | OD); else OMAP_HSMMC_WRITE(host->base, CON, con & ~OD); if (host->power_mode == MMC_POWER_OFF) mmc_host_disable(host->mmc); else mmc_host_lazy_disable(host->mmc); } static int omap_hsmmc_get_cd(struct mmc_host *mmc) { struct omap_hsmmc_host *host = mmc_priv(mmc); if (!mmc_slot(host).card_detect) return -ENOSYS; return mmc_slot(host).card_detect(host->dev, host->slot_id); } static int omap_hsmmc_get_ro(struct mmc_host *mmc) { struct omap_hsmmc_host *host = mmc_priv(mmc); if (!mmc_slot(host).get_ro) return -ENOSYS; return mmc_slot(host).get_ro(host->dev, 0); } static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card) { struct omap_hsmmc_host *host = mmc_priv(mmc); if (mmc_slot(host).init_card) mmc_slot(host).init_card(card); } static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host) { u32 hctl, capa, value; /* Only MMC1 supports 3.0V */ if (host->id == OMAP_MMC1_DEVID) { hctl = SDVS30; capa = VS30 | VS18; } else { hctl = SDVS18; capa = VS18; } value = OMAP_HSMMC_READ(host->base, HCTL) & ~SDVS_MASK; OMAP_HSMMC_WRITE(host->base, HCTL, value | hctl); value = OMAP_HSMMC_READ(host->base, CAPA); OMAP_HSMMC_WRITE(host->base, CAPA, value | capa); /* Set the controller to AUTO IDLE mode */ value = OMAP_HSMMC_READ(host->base, SYSCONFIG); OMAP_HSMMC_WRITE(host->base, SYSCONFIG, value | AUTOIDLE); /* Set SD bus power bit */ set_sd_bus_power(host); } /* * Dynamic power saving handling, FSM: * ENABLED -> DISABLED -> CARDSLEEP / REGSLEEP -> OFF * ^___________| | | * |______________________|______________________| * * ENABLED: mmc host is fully functional * DISABLED: fclk is off * CARDSLEEP: fclk is off, card is asleep, voltage regulator is asleep * REGSLEEP: fclk is off, voltage regulator is asleep * OFF: fclk is off, voltage regulator is off * * Transition handlers return the timeout for the next state transition * or negative error. */ enum {ENABLED = 0, DISABLED, CARDSLEEP, REGSLEEP, OFF}; /* Handler for [ENABLED -> DISABLED] transition */ static int omap_hsmmc_enabled_to_disabled(struct omap_hsmmc_host *host) { omap_hsmmc_context_save(host); clk_disable(host->fclk); host->dpm_state = DISABLED; dev_dbg(mmc_dev(host->mmc), "ENABLED -> DISABLED\n"); if (host->power_mode == MMC_POWER_OFF) return 0; return OMAP_MMC_SLEEP_TIMEOUT; } /* Handler for [DISABLED -> REGSLEEP / CARDSLEEP] transition */ static int omap_hsmmc_disabled_to_sleep(struct omap_hsmmc_host *host) { int err, new_state; if (!mmc_try_claim_host(host->mmc)) return 0; clk_enable(host->fclk); omap_hsmmc_context_restore(host); if (mmc_card_can_sleep(host->mmc)) { err = mmc_card_sleep(host->mmc); if (err < 0) { clk_disable(host->fclk); mmc_release_host(host->mmc); return err; } new_state = CARDSLEEP; } else { new_state = REGSLEEP; } if (mmc_slot(host).set_sleep) mmc_slot(host).set_sleep(host->dev, host->slot_id, 1, 0, new_state == CARDSLEEP); /* FIXME: turn off bus power and perhaps interrupts too */ clk_disable(host->fclk); host->dpm_state = new_state; mmc_release_host(host->mmc); dev_dbg(mmc_dev(host->mmc), "DISABLED -> %s\n", host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP"); if (mmc_slot(host).no_off) return 0; if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) || mmc_slot(host).card_detect || (mmc_slot(host).get_cover_state && mmc_slot(host).get_cover_state(host->dev, host->slot_id))) return OMAP_MMC_OFF_TIMEOUT; return 0; } /* Handler for [REGSLEEP / CARDSLEEP -> OFF] transition */ static int omap_hsmmc_sleep_to_off(struct omap_hsmmc_host *host) { if (!mmc_try_claim_host(host->mmc)) return 0; if (mmc_slot(host).no_off) return 0; if (!((host->mmc->caps & MMC_CAP_NONREMOVABLE) || mmc_slot(host).card_detect || (mmc_slot(host).get_cover_state && mmc_slot(host).get_cover_state(host->dev, host->slot_id)))) { mmc_release_host(host->mmc); return 0; } mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0); host->vdd = 0; host->power_mode = MMC_POWER_OFF; dev_dbg(mmc_dev(host->mmc), "%s -> OFF\n", host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP"); host->dpm_state = OFF; mmc_release_host(host->mmc); return 0; } /* Handler for [DISABLED -> ENABLED] transition */ static int omap_hsmmc_disabled_to_enabled(struct omap_hsmmc_host *host) { int err; err = clk_enable(host->fclk); if (err < 0) return err; omap_hsmmc_context_restore(host); host->dpm_state = ENABLED; dev_dbg(mmc_dev(host->mmc), "DISABLED -> ENABLED\n"); return 0; } /* Handler for [SLEEP -> ENABLED] transition */ static int omap_hsmmc_sleep_to_enabled(struct omap_hsmmc_host *host) { if (!mmc_try_claim_host(host->mmc)) return 0; clk_enable(host->fclk); omap_hsmmc_context_restore(host); if (mmc_slot(host).set_sleep) mmc_slot(host).set_sleep(host->dev, host->slot_id, 0, host->vdd, host->dpm_state == CARDSLEEP); if (mmc_card_can_sleep(host->mmc)) mmc_card_awake(host->mmc); dev_dbg(mmc_dev(host->mmc), "%s -> ENABLED\n", host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP"); host->dpm_state = ENABLED; mmc_release_host(host->mmc); return 0; } /* Handler for [OFF -> ENABLED] transition */ static int omap_hsmmc_off_to_enabled(struct omap_hsmmc_host *host) { clk_enable(host->fclk); omap_hsmmc_context_restore(host); omap_hsmmc_conf_bus_power(host); mmc_power_restore_host(host->mmc); host->dpm_state = ENABLED; dev_dbg(mmc_dev(host->mmc), "OFF -> ENABLED\n"); return 0; } /* * Bring MMC host to ENABLED from any other PM state. */ static int omap_hsmmc_enable(struct mmc_host *mmc) { struct omap_hsmmc_host *host = mmc_priv(mmc); switch (host->dpm_state) { case DISABLED: return omap_hsmmc_disabled_to_enabled(host); case CARDSLEEP: case REGSLEEP: return omap_hsmmc_sleep_to_enabled(host); case OFF: return omap_hsmmc_off_to_enabled(host); default: dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n"); return -EINVAL; } } /* * Bring MMC host in PM state (one level deeper). */ static int omap_hsmmc_disable(struct mmc_host *mmc, int lazy) { struct omap_hsmmc_host *host = mmc_priv(mmc); switch (host->dpm_state) { case ENABLED: { int delay; delay = omap_hsmmc_enabled_to_disabled(host); if (lazy || delay < 0) return delay; return 0; } case DISABLED: return omap_hsmmc_disabled_to_sleep(host); case CARDSLEEP: case REGSLEEP: return omap_hsmmc_sleep_to_off(host); default: dev_dbg(mmc_dev(host->mmc), "UNKNOWN state\n"); return -EINVAL; } } static int omap_hsmmc_enable_fclk(struct mmc_host *mmc) { struct omap_hsmmc_host *host = mmc_priv(mmc); int err; err = clk_enable(host->fclk); if (err) return err; dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n"); omap_hsmmc_context_restore(host); return 0; } static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy) { struct omap_hsmmc_host *host = mmc_priv(mmc); omap_hsmmc_context_save(host); clk_disable(host->fclk); dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n"); return 0; } static const struct mmc_host_ops omap_hsmmc_ops = { .enable = omap_hsmmc_enable_fclk, .disable = omap_hsmmc_disable_fclk, .request = omap_hsmmc_request, .set_ios = omap_hsmmc_set_ios, .get_cd = omap_hsmmc_get_cd, .get_ro = omap_hsmmc_get_ro, .init_card = omap_hsmmc_init_card, /* NYET -- enable_sdio_irq */ }; static const struct mmc_host_ops omap_hsmmc_ps_ops = { .enable = omap_hsmmc_enable, .disable = omap_hsmmc_disable, .request = omap_hsmmc_request, .set_ios = omap_hsmmc_set_ios, .get_cd = omap_hsmmc_get_cd, .get_ro = omap_hsmmc_get_ro, .init_card = omap_hsmmc_init_card, /* NYET -- enable_sdio_irq */ }; #ifdef CONFIG_DEBUG_FS static int omap_hsmmc_regs_show(struct seq_file *s, void *data) { struct mmc_host *mmc = s->private; struct omap_hsmmc_host *host = mmc_priv(mmc); int context_loss = 0; if (host->pdata->get_context_loss_count) context_loss = host->pdata->get_context_loss_count(host->dev); seq_printf(s, "mmc%d:\n" " enabled:\t%d\n" " dpm_state:\t%d\n" " nesting_cnt:\t%d\n" " ctx_loss:\t%d:%d\n" "\nregs:\n", mmc->index, mmc->enabled ? 1 : 0, host->dpm_state, mmc->nesting_cnt, host->context_loss, context_loss); if (host->suspended || host->dpm_state == OFF) { seq_printf(s, "host suspended, can't read registers\n"); return 0; } if (clk_enable(host->fclk) != 0) { seq_printf(s, "can't read the regs\n"); return 0; } seq_printf(s, "SYSCONFIG:\t0x%08x\n", OMAP_HSMMC_READ(host->base, SYSCONFIG)); seq_printf(s, "CON:\t\t0x%08x\n", OMAP_HSMMC_READ(host->base, CON)); seq_printf(s, "HCTL:\t\t0x%08x\n", OMAP_HSMMC_READ(host->base, HCTL)); seq_printf(s, "SYSCTL:\t\t0x%08x\n", OMAP_HSMMC_READ(host->base, SYSCTL)); seq_printf(s, "IE:\t\t0x%08x\n", OMAP_HSMMC_READ(host->base, IE)); seq_printf(s, "ISE:\t\t0x%08x\n", OMAP_HSMMC_READ(host->base, ISE)); seq_printf(s, "CAPA:\t\t0x%08x\n", OMAP_HSMMC_READ(host->base, CAPA)); clk_disable(host->fclk); return 0; } static int omap_hsmmc_regs_open(struct inode *inode, struct file *file) { return single_open(file, omap_hsmmc_regs_show, inode->i_private); } static const struct file_operations mmc_regs_fops = { .open = omap_hsmmc_regs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void omap_hsmmc_debugfs(struct mmc_host *mmc) { if (mmc->debugfs_root) debugfs_create_file("regs", S_IRUSR, mmc->debugfs_root, mmc, &mmc_regs_fops); } #else static void omap_hsmmc_debugfs(struct mmc_host *mmc) { } #endif static int __init omap_hsmmc_probe(struct platform_device *pdev) { struct omap_mmc_platform_data *pdata = pdev->dev.platform_data; struct mmc_host *mmc; struct omap_hsmmc_host *host = NULL; struct resource *res; int ret, irq; if (pdata == NULL) { dev_err(&pdev->dev, "Platform Data is missing\n"); return -ENXIO; } if (pdata->nr_slots == 0) { dev_err(&pdev->dev, "No Slots\n"); return -ENXIO; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_irq(pdev, 0); if (res == NULL || irq < 0) return -ENXIO; res->start += pdata->reg_offset; res->end += pdata->reg_offset; res = request_mem_region(res->start, res->end - res->start + 1, pdev->name); if (res == NULL) return -EBUSY; ret = omap_hsmmc_gpio_init(pdata); if (ret) goto err; mmc = mmc_alloc_host(sizeof(struct omap_hsmmc_host), &pdev->dev); if (!mmc) { ret = -ENOMEM; goto err_alloc; } host = mmc_priv(mmc); host->mmc = mmc; host->pdata = pdata; host->dev = &pdev->dev; host->use_dma = 1; host->dev->dma_mask = &pdata->dma_mask; host->dma_ch = -1; host->irq = irq; host->id = pdev->id; host->slot_id = 0; host->mapbase = res->start; host->base = ioremap(host->mapbase, SZ_4K); host->power_mode = MMC_POWER_OFF; platform_set_drvdata(pdev, host); INIT_WORK(&host->mmc_carddetect_work, omap_hsmmc_detect); if (mmc_slot(host).power_saving) mmc->ops = &omap_hsmmc_ps_ops; else mmc->ops = &omap_hsmmc_ops; /* * If regulator_disable can only put vcc_aux to sleep then there is * no off state. */ if (mmc_slot(host).vcc_aux_disable_is_sleep) mmc_slot(host).no_off = 1; mmc->f_min = 400000; mmc->f_max = 52000000; spin_lock_init(&host->irq_lock); host->iclk = clk_get(&pdev->dev, "ick"); if (IS_ERR(host->iclk)) { ret = PTR_ERR(host->iclk); host->iclk = NULL; goto err1; } host->fclk = clk_get(&pdev->dev, "fck"); if (IS_ERR(host->fclk)) { ret = PTR_ERR(host->fclk); host->fclk = NULL; clk_put(host->iclk); goto err1; } omap_hsmmc_context_save(host); mmc->caps |= MMC_CAP_DISABLE; mmc_set_disable_delay(mmc, OMAP_MMC_DISABLED_TIMEOUT); /* we start off in DISABLED state */ host->dpm_state = DISABLED; if (mmc_host_enable(host->mmc) != 0) { clk_put(host->iclk); clk_put(host->fclk); goto err1; } if (clk_enable(host->iclk) != 0) { mmc_host_disable(host->mmc); clk_put(host->iclk); clk_put(host->fclk); goto err1; } if (cpu_is_omap2430()) { host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck"); /* * MMC can still work without debounce clock. */ if (IS_ERR(host->dbclk)) dev_warn(mmc_dev(host->mmc), "Failed to get debounce clock\n"); else host->got_dbclk = 1; if (host->got_dbclk) if (clk_enable(host->dbclk) != 0) dev_dbg(mmc_dev(host->mmc), "Enabling debounce" " clk failed\n"); } /* Since we do only SG emulation, we can have as many segs * as we want. */ mmc->max_segs = 1024; mmc->max_blk_size = 512; /* Block Length at max can be 1024 */ mmc->max_blk_count = 0xFFFF; /* No. of Blocks is 16 bits */ mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; mmc->max_seg_size = mmc->max_req_size; mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED | MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_ERASE; mmc->caps |= mmc_slot(host).caps; if (mmc->caps & MMC_CAP_8_BIT_DATA) mmc->caps |= MMC_CAP_4_BIT_DATA; if (mmc_slot(host).nonremovable) mmc->caps |= MMC_CAP_NONREMOVABLE; omap_hsmmc_conf_bus_power(host); /* Select DMA lines */ switch (host->id) { case OMAP_MMC1_DEVID: host->dma_line_tx = OMAP24XX_DMA_MMC1_TX; host->dma_line_rx = OMAP24XX_DMA_MMC1_RX; break; case OMAP_MMC2_DEVID: host->dma_line_tx = OMAP24XX_DMA_MMC2_TX; host->dma_line_rx = OMAP24XX_DMA_MMC2_RX; break; case OMAP_MMC3_DEVID: host->dma_line_tx = OMAP34XX_DMA_MMC3_TX; host->dma_line_rx = OMAP34XX_DMA_MMC3_RX; break; case OMAP_MMC4_DEVID: host->dma_line_tx = OMAP44XX_DMA_MMC4_TX; host->dma_line_rx = OMAP44XX_DMA_MMC4_RX; break; case OMAP_MMC5_DEVID: host->dma_line_tx = OMAP44XX_DMA_MMC5_TX; host->dma_line_rx = OMAP44XX_DMA_MMC5_RX; break; default: dev_err(mmc_dev(host->mmc), "Invalid MMC id\n"); goto err_irq; } /* Request IRQ for MMC operations */ ret = request_irq(host->irq, omap_hsmmc_irq, IRQF_DISABLED, mmc_hostname(mmc), host); if (ret) { dev_dbg(mmc_dev(host->mmc), "Unable to grab HSMMC IRQ\n"); goto err_irq; } if (pdata->init != NULL) { if (pdata->init(&pdev->dev) != 0) { dev_dbg(mmc_dev(host->mmc), "Unable to configure MMC IRQs\n"); goto err_irq_cd_init; } } if (omap_hsmmc_have_reg() && !mmc_slot(host).set_power) { ret = omap_hsmmc_reg_get(host); if (ret) goto err_reg; host->use_reg = 1; } mmc->ocr_avail = mmc_slot(host).ocr_mask; /* Request IRQ for card detect */ if ((mmc_slot(host).card_detect_irq)) { ret = request_irq(mmc_slot(host).card_detect_irq, omap_hsmmc_cd_handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_DISABLED, mmc_hostname(mmc), host); if (ret) { dev_dbg(mmc_dev(host->mmc), "Unable to grab MMC CD IRQ\n"); goto err_irq_cd; } } omap_hsmmc_disable_irq(host); mmc_host_lazy_disable(host->mmc); omap_hsmmc_protect_card(host); mmc_add_host(mmc); if (mmc_slot(host).name != NULL) { ret = device_create_file(&mmc->class_dev, &dev_attr_slot_name); if (ret < 0) goto err_slot_name; } if (mmc_slot(host).card_detect_irq && mmc_slot(host).get_cover_state) { ret = device_create_file(&mmc->class_dev, &dev_attr_cover_switch); if (ret < 0) goto err_slot_name; } omap_hsmmc_debugfs(mmc); return 0; err_slot_name: mmc_remove_host(mmc); free_irq(mmc_slot(host).card_detect_irq, host); err_irq_cd: if (host->use_reg) omap_hsmmc_reg_put(host); err_reg: if (host->pdata->cleanup) host->pdata->cleanup(&pdev->dev); err_irq_cd_init: free_irq(host->irq, host); err_irq: mmc_host_disable(host->mmc); clk_disable(host->iclk); clk_put(host->fclk); clk_put(host->iclk); if (host->got_dbclk) { clk_disable(host->dbclk); clk_put(host->dbclk); } err1: iounmap(host->base); platform_set_drvdata(pdev, NULL); mmc_free_host(mmc); err_alloc: omap_hsmmc_gpio_free(pdata); err: release_mem_region(res->start, res->end - res->start + 1); return ret; } static int omap_hsmmc_remove(struct platform_device *pdev) { struct omap_hsmmc_host *host = platform_get_drvdata(pdev); struct resource *res; if (host) { mmc_host_enable(host->mmc); mmc_remove_host(host->mmc); if (host->use_reg) omap_hsmmc_reg_put(host); if (host->pdata->cleanup) host->pdata->cleanup(&pdev->dev); free_irq(host->irq, host); if (mmc_slot(host).card_detect_irq) free_irq(mmc_slot(host).card_detect_irq, host); flush_scheduled_work(); mmc_host_disable(host->mmc); clk_disable(host->iclk); clk_put(host->fclk); clk_put(host->iclk); if (host->got_dbclk) { clk_disable(host->dbclk); clk_put(host->dbclk); } mmc_free_host(host->mmc); iounmap(host->base); omap_hsmmc_gpio_free(pdev->dev.platform_data); } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res) release_mem_region(res->start, res->end - res->start + 1); platform_set_drvdata(pdev, NULL); return 0; } #ifdef CONFIG_PM static int omap_hsmmc_suspend(struct device *dev) { int ret = 0; struct platform_device *pdev = to_platform_device(dev); struct omap_hsmmc_host *host = platform_get_drvdata(pdev); if (host && host->suspended) return 0; if (host) { host->suspended = 1; if (host->pdata->suspend) { ret = host->pdata->suspend(&pdev->dev, host->slot_id); if (ret) { dev_dbg(mmc_dev(host->mmc), "Unable to handle MMC board" " level suspend\n"); host->suspended = 0; return ret; } } cancel_work_sync(&host->mmc_carddetect_work); ret = mmc_suspend_host(host->mmc); mmc_host_enable(host->mmc); if (ret == 0) { omap_hsmmc_disable_irq(host); OMAP_HSMMC_WRITE(host->base, HCTL, OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP); mmc_host_disable(host->mmc); clk_disable(host->iclk); if (host->got_dbclk) clk_disable(host->dbclk); } else { host->suspended = 0; if (host->pdata->resume) { ret = host->pdata->resume(&pdev->dev, host->slot_id); if (ret) dev_dbg(mmc_dev(host->mmc), "Unmask interrupt failed\n"); } mmc_host_disable(host->mmc); } } return ret; } /* Routine to resume the MMC device */ static int omap_hsmmc_resume(struct device *dev) { int ret = 0; struct platform_device *pdev = to_platform_device(dev); struct omap_hsmmc_host *host = platform_get_drvdata(pdev); if (host && !host->suspended) return 0; if (host) { ret = clk_enable(host->iclk); if (ret) goto clk_en_err; if (mmc_host_enable(host->mmc) != 0) { clk_disable(host->iclk); goto clk_en_err; } if (host->got_dbclk) clk_enable(host->dbclk); omap_hsmmc_conf_bus_power(host); if (host->pdata->resume) { ret = host->pdata->resume(&pdev->dev, host->slot_id); if (ret) dev_dbg(mmc_dev(host->mmc), "Unmask interrupt failed\n"); } omap_hsmmc_protect_card(host); /* Notify the core to resume the host */ ret = mmc_resume_host(host->mmc); if (ret == 0) host->suspended = 0; mmc_host_lazy_disable(host->mmc); } return ret; clk_en_err: dev_dbg(mmc_dev(host->mmc), "Failed to enable MMC clocks during resume\n"); return ret; } #else #define omap_hsmmc_suspend NULL #define omap_hsmmc_resume NULL #endif static struct dev_pm_ops omap_hsmmc_dev_pm_ops = { .suspend = omap_hsmmc_suspend, .resume = omap_hsmmc_resume, }; static struct platform_driver omap_hsmmc_driver = { .remove = omap_hsmmc_remove, .driver = { .name = DRIVER_NAME, .owner = THIS_MODULE, .pm = &omap_hsmmc_dev_pm_ops, }, }; static int __init omap_hsmmc_init(void) { /* Register the MMC driver */ return platform_driver_probe(&omap_hsmmc_driver, omap_hsmmc_probe); } static void __exit omap_hsmmc_cleanup(void) { /* Unregister MMC driver */ platform_driver_unregister(&omap_hsmmc_driver); } module_init(omap_hsmmc_init); module_exit(omap_hsmmc_cleanup); MODULE_DESCRIPTION("OMAP High Speed Multimedia Card driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRIVER_NAME); MODULE_AUTHOR("Texas Instruments Inc");